1N4118UR/TR

Single Zener Diodes Overview

The Microchip Technology 1N4118UR/TR is a glass surface mount Zener voltage regulator belonging to the 1N4099UR through 1N4135UR series. It features a DO-213AA (SOD80/MLL34) MELF package and provides a nominal Zener voltage of 27 V with a standard tolerance of ±5%. The device operates at a test current of 250 μA, exhibits a maximum Zener impedance of 150 Ω, and supports a steady-state power dissipation of 0.5 W. It includes a tape and reel option for automated assembly.

Single Zener Diodes Feature Summary

• Hermetically sealed glass DO-213AA MELF package construction
• Surface mount equivalent to JEDEC registered axial-leaded equivalents
• Inherently radiation hard design
• Minimal capacitance characteristics

Single Zener Diodes Applications

• Voltage regulation in broad operating current ranges
• Temperature-compensated reference applications
• Protection circuits requiring radiation hardness

Single Zener Diodes Procurement Notes

Verify the specific suffix configuration against the datasheet to ensure correct tolerance and termination plating options. Confirm that the TR suffix indicates tape and reel packaging per EIA-481-1-A standards. Cross-reference the manufacturer part number with the industry JEDEC designation to ensure compatibility with existing bill of materials.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for high-reliability environments. The 27 V nominal rating suits applications needing precise voltage clamping or referencing. Consider the 0.5 W power dissipation limit and thermal resistance values when designing the PCB footprint and heat dissipation strategy.

Single Zener Diodes Part Context

This part belongs to the Microsemi Scottsdale Division 1N4099UR through 1N4135UR series of 0.5 watt glass surface mount Zeners. These devices are designed as direct surface mount replacements for traditional axial-leaded components while offering enhanced reliability features such as metallurgical bonding options and radiation hardness suitable for demanding industrial and aerospace applications.

Single Zener Diodes Replacement Considerations

JAN1N4118DUR-1

Single Zener Diodes FAQ

What is the maximum reverse current specification for the 1N4118UR?

The maximum reverse current is specified as 20.45 μA at a reverse voltage of 20.45 V.

How is polarity indicated on the 1N4118UR package?

Polarity is indicated by a cathode band where the diode is to be operated with the banded end positive with respect to the opposite end for Zener regulation.